From nstewart@ox.ac.uk Fri Jan 13 11:31:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!nstewart From: nstewart@ox.ac.uk (Nadia Stewart) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan13.113130.9568@ox.ac.uk> Date: Fri, 13 Jan 1995 11:31:30 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Nadia Stewart Tape trading list upon request. SASE required for international mail. From cchoi@purdue.edu Fri Jan 13 22:25:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!cchoi From: cchoi@purdue.edu (Callum Choi) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan13.222530.6407@purdue.edu> Date: Fri, 13 Jan 1995 22:25:30 GMT References: <1995Jan13.113130.9568@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jan13.113130.9568@ox.ac.uk>, nstewart@ox.ac.uk (Nadia Stewart) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Callum Choi "Hold for relay." 486DX2/66 (Linux 1.2.13) / System 7.5.1 From lfischer@stanford.edu Sat Jan 14 22:17:30 1995 Path: ashpoly!cascade!mxgate!coyoacan!stanford!lfischer From: lfischer@stanford.edu (Lucia Fischer) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan14.221730.9798@stanford.edu> Date: Sat, 14 Jan 1995 22:17:30 GMT References: <1995Jan13.113130.9568@ox.ac.uk> <1995Jan13.222530.6407@purdue.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Jan13.222530.6407@purdue.edu>, cchoi@purdue.edu (Callum Choi) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. If you are posting from AOL, please read RFC 1036 before posting again. -- Lucia Fischer | lfischer@stanford.edu PGP Key fingerprint: DAB1 FD7D 4D72 75CE "Keep the channels open." From nramirez@demon.co.uk Sun Jan 15 22:50:30 1995 Path: ashpoly!cascade!brgate!saturno!demon!nramirez From: nramirez@demon.co.uk (Nadia Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan15.225030.6519@demon.co.uk> Date: Sun, 15 Jan 1995 22:50:30 GMT References: <1995Jan13.113130.9568@ox.ac.uk> <1995Jan13.222530.6407@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan13.222530.6407@purdue.edu>, cchoi@purdue.edu (Callum Choi) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Nadia Ramírez Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------